Pump body assembly and fluid machine

Abstract

The pump body assembly comprises a crankshaft, a cylinder body, a roller and a sliding block, the crankshaft is arranged in the cylinder body in a penetrating mode, the crankshaft is eccentrically arranged relative to the cylinder body, and the eccentric distance is fixed; the roller is rotatably arranged in the cylinder body and sleeves the outer side of the crankshaft; the sliding block is provided with a center hole allowing a crankshaft to penetrate through, the sliding block is arranged in a sliding mode relative to the roller, the peripheral side of the sliding block comprises a first sliding face, a first transition face, a second sliding face and a second transition face which are sequentially connected end to end, and the first sliding face and the second sliding face are opposite and are in sliding fit with the inner surface of the roller; and the first transition surface and the second transition surface are two cambered surface sections on the same cylindrical surface. The sliding block of the rotary cylinder pump solves the problem that in the prior art, due to the fact that machining of the sliding block of the rotary cylinder pump is complex, manufacturing cost of the sliding block is high.

Description

Technical Field

[0001] The utility model relates to the field of fluid machinery, in particular to a pump body component and a fluid machinery. Background Art

[0002] In current fluorine pumps, the cylinder and crankshaft are eccentrically designed, with the roller rotatably arranged in the cylinder. The slider is located in the roller's limiting groove and reciprocates. In order to reduce the clearance between the slider heads, the slider heads are usually designed to have two non-concentric arcs. When the slider moves to one end of the roller's limiting groove, the slider head arc at this end is flush with the roller's outer circle. At this time, the compressor has completed exhaust and the volume of the volume chamber is close to zero. Similarly, when the slider moves to the other end of the roller's limiting groove, the slider head arc at the other end also needs to be flush with the roller's outer circle, thus forming two non-concentric arcs on the slider head. This type of slider structure requires two arcs to be machined separately during processing, and the machining requirements for size and form and position tolerances are high, which makes the processing difficult and expensive. There is another slider structure, which is designed to be cylindrical. Although this structure can solve the problem of complex slider processing, which leads to high manufacturing costs of fluorine pumps, the limiting grooves of the slider and the roller are in line contact, and the sealing effect is poor, which can easily cause the refrigerant to leak from the high-pressure side volume cavity to the low-pressure side volume cavity, resulting in a decrease in the volumetric efficiency of the rotary cylinder pump and affecting performance. Utility Model Content

[0003] The main purpose of the utility model is to provide a pump body assembly and a fluid machine to solve the problem in the prior art that the processing of the slider of the rotary cylinder pump is relatively complicated, resulting in high manufacturing costs.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, a pump body assembly is provided, including a crankshaft, a cylinder body, a roller and a slider, the crankshaft is passed through the cylinder body, and the crankshaft is eccentrically arranged relative to the cylinder body and the eccentric distance is fixed; the roller is rotatably arranged in the cylinder body and sleeved on the outside of the crankshaft; the slider has a center hole for the crankshaft to pass through, and the slider is slidably arranged relative to the roller, wherein the outer peripheral side of the slider includes a first sliding surface, a first transition surface, a second sliding surface and a second transition surface connected in sequence end to end, the first sliding surface is opposite to the second sliding surface and slides with the inner surface of the roller, and the first transition surface and the second transition surface are two arc surface segments on the same cylindrical surface.

[0005] Furthermore, the curvature radius of the first transition surface is smaller than half of the inner diameter of the cylinder body.

[0006] Furthermore, the first sliding surface is a plane, an arcuate surface, or a combination of a plane and an arcuate surface.

[0007] Furthermore, along a direction perpendicular to the axis of the slider, a central angle A corresponding to a projection arc of the first transition surface satisfies: 10°≤A≤170°.

[0008] Furthermore, the diameter D1 of the center hole, the diameter D2 of the first transition surface and the inner diameter D3 of the cylinder body satisfy the following conditions: D1 <D2<D3*0.25。

[0009] Furthermore, the roller has a third sliding surface matched with the first sliding surface, and an extension length L1 of the first sliding surface in the circumferential direction of the slider and a length L3 of the third sliding surface satisfy: 0.1≤L1 / L3≤1.

[0010] Furthermore, the first sliding surface and the second sliding surface have the same extension length in the circumferential direction of the slider; and / or the first transition surface and the second transition surface have the same extension length in the circumferential direction of the slider.

[0011] Furthermore, the crankshaft has two eccentric parts, and the sliders have two eccentric parts. The two eccentric parts are correspondingly located in the center holes of the two sliders, and the eccentric directions of the two eccentric parts differ by 180°.

[0012] Furthermore, the cylinder body has a liquid suction channel and a liquid discharge channel. The liquid suction channel and the liquid discharge channel are arranged on the peripheral side surface of the cylinder body opposite to each other and are both communicated with the inner cavity of the cylinder body.

[0013] According to another aspect of the present invention, a fluid machine is provided, comprising the above-mentioned pump body assembly.

[0014] Furthermore, the fluid machinery is a fluorine pump.

[0015] By applying the technical solution of the present invention, the outer peripheral side of the slider is provided with a first sliding surface, a first transition surface, a second sliding surface and a second transition surface which are connected in sequence end to end. On the one hand, the cylindrical surface where the first transition surface is located and the cylindrical surface where the second transition surface is located are the same cylindrical surface, thereby reducing the processing difficulty, and being beneficial to improving the processing accuracy and reducing the processing cost. On the other hand, the first sliding surface and the second sliding surface are sealed with the inner surface of the roller through surface contact, thereby improving the sealing effect and avoiding the leakage of flowing media such as refrigerant from the contact surface of the slider and the roller, thereby reducing the performance of the pump body assembly. In this way, this embodiment optimizes the structure of the slider, reduces the processing difficulty of the slider, and reduces the processing cost of parts while ensuring the sealing performance of the slider and the roller. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1An exploded view of a pump assembly according to the present invention is shown;

[0018] Figure 2 Shows a transverse cross-sectional view of the pump assembly of the present invention;

[0019] Figure 3 An axial cross-sectional view of the pump assembly of the present invention is shown;

[0020] Figure 4 Shows a top view of the slider of the present invention;

[0021] Figure 5 A top view of the cylinder body of the present invention is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Crankshaft; 11. Eccentric portion; 20. Cylinder block; 21. Suction channel; 22. Discharge channel; 30. Roller; 40. Slider; 41. First sliding surface; 42. First transition surface; 43. Second sliding surface; 44. Second transition surface; 45. Center hole; 50. Upper flange; 60. Lower flange. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0026] In the present invention, unless otherwise specified, directional words such as "up, down, top, bottom" are usually used with reference to the directions shown in the drawings, or with reference to the components themselves in the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0027] In order to solve the problem in the prior art that the processing of the slider of the rotary cylinder pump is relatively complicated and leads to high manufacturing cost, the utility model provides a pump body assembly and a fluid machine.

[0028] like Figures 1 to 5A pump body assembly shown includes a crankshaft 10, a cylinder body 20, a roller 30 and a slider 40. The crankshaft 10 is inserted into the cylinder body 20 and is eccentrically arranged relative to the cylinder body 20 and the eccentric distance is fixed; the roller 30 is rotatably arranged in the cylinder body 20 and sleeved on the outside of the crankshaft 10; the slider 40 has a center hole 45 for the crankshaft 10 to pass through, and the slider 40 is slidably arranged relative to the roller 30, wherein the outer peripheral side of the slider 40 includes a first sliding surface 41, a first transition surface 42, a second sliding surface 43 and a second transition surface 44 connected in sequence end to end, the first sliding surface 41 is opposite to the second sliding surface 43 and slides with the inner surface of the roller 30, and the first transition surface 42 and the second transition surface 44 are two arc surface segments on the same cylindrical surface.

[0029] In this embodiment, the outer peripheral side of the slider 40 includes a first sliding surface 41, a first transition surface 42, a second sliding surface 43 and a second transition surface 44 connected in sequence. On the one hand, the cylindrical surface where the first transition surface 42 is located and the cylindrical surface where the second transition surface 44 is located are the same cylindrical surface, thereby reducing the processing difficulty, and is conducive to improving the processing accuracy and reducing the processing cost. On the other hand, the first sliding surface 41 and the second sliding surface 43 are sealed with the inner surface of the roller 30 through surface contact, thereby improving the sealing effect and avoiding the leakage of refrigerant and other flowing media from the contact surface of the slider 40 and the roller 30 to reduce the performance of the pump body assembly. In this way, this embodiment optimizes the structure of the slider 40 while ensuring the sealing performance of the slider 40 and the roller 30, reduces the processing difficulty of the slider 40, and reduces the parts processing cost.

[0030] It should be noted that the pump body assembly of this embodiment also includes an upper flange 50 and a lower flange 60, which are respectively arranged at the two axial ends of the cylinder body 20. The cylinder body 20 has an internal accommodating cavity, and the roller 30 and the slider 40 are both arranged in the accommodating cavity and rotate under the drive of the crankshaft 10. The roller 30 is generally configured as a cylinder with a limiting channel. The limiting channel passes horizontally through the outer circumference of the roller 30. The slider 40 is located in the limiting channel and slides back and forth along the extension direction of the limiting channel. The crankshaft 10 passes through the center hole 45 of the slider 40, driving the slider 40 and the roller 30 to move.

[0031] In this embodiment, the curvature radius of the first transition surface 42 is less than half of the inner diameter of the cylinder body 20, that is, the cylindrical surface where the first transition surface 42 and the second transition surface 44 are located is smaller than the inner diameter of the cylinder body 20, thereby ensuring that the slider 40 can be placed in the cylinder body 20, and ensuring that there is residual space in the cylinder body 20 so that the slider 40 can rotate under the drive of the crankshaft 10, thereby making the movement of the slider 40 in the cylinder body 20 smoother, reducing the additional friction caused by the excessive curvature of the transition surface, and further improving the operating efficiency and stability of the pump body assembly.

[0032] In this embodiment, the first sliding surface 41 is a plane, an arcuate surface, or a combination of a plane and an arcuate surface, thereby ensuring effective sealing between the first sliding surface 41 and the limiting channel of the roller 30 and ensuring smooth operation of the pump.

[0033] Specifically, if Figure 1 As shown, the first sliding surface 41 and the second sliding surface 43 of this embodiment are both set to be planes, and the surface where the roller 30 contacts the slider 40 is also set to be planes. In this way, when the slider 40 is located in the limiting channel and slides along the extension direction of the limiting channel, the slider 40 maintains surface contact with the roller 30, thereby ensuring the sealing effect between the roller 30 and the slider 40, and avoiding leakage between the fluids at both ends of the limiting channel.

[0034] According to different working environments and fluid characteristics, the first sliding surface 41 and the second sliding surface 43 can also be set as arc surfaces. For example, the first sliding surface 41 and the second sliding surface 43 can be set to a structure similar to a wave line, and the wave line extends along the extension direction of the limiting channel. In this way, along the extension direction of the limiting channel, multiple line seals are passed between the first sliding surface 41 and the roller 30, thereby achieving a sealing effect close to that of a surface seal; the second sliding surface 43 is also sealed with multiple line seals between it and the roller 30, thereby achieving a sealing effect close to that of a surface seal, and can balance the sealing performance and wear resistance, thereby extending the working life of the pump body assembly in harsh environments.

[0035] In other embodiments not shown in the figures, the first sliding surface 41 and the second sliding surface 43 can also be set to a structural form of a combination of a plane and an arc surface. For example, along the extension direction of the limiting channel, the two ends of the first sliding surface 41 are set to planes, and the middle part is set to an arc surface that does not protrude from the plane part, so that the first sliding surface 41 and the roller 30 can achieve a sealing effect through the surface sealing at both ends; the second sliding surface 43 is set to the same structural form as the first sliding surface 41.

[0036] Of course, the second sliding surface 43 can be set to the same structural form as the first sliding surface 41, or it can be set to a structural form different from the first sliding surface 41. For example, the first sliding surface 41 can be set to a plane, and the second sliding surface 43 can be set to a structural form that is a combination of a plane and an arc surface. Compared with the structure of the existing cylindrical slider 40, it can also improve the sealing effect, thereby improving the operating efficiency of the pump body assembly.

[0037] In this embodiment, along the direction perpendicular to the axis of the slider 40, the central angle A corresponding to the projected arc of the first transition surface 42 satisfies: 10°≤A≤170°, so that the area of the first sliding surface 41 will not be too small to affect the sealing performance, nor will the area of the first sliding surface 41 be too large to affect the sliding trajectory of the slider 40 in the roller 30.

[0038] Specifically, the size of the central angle A in this embodiment determines the ratio of the first sliding surface 41 to the first transition surface 42, that is, the ratio of the length where the slider 40 contacts the roller 30 to the length where the slider 40 does not contact the roller 30. In this way, by controlling the size of the central angle A, the movement trajectory of the slider 40 is optimized, the contact stress between the slider 40 and the roller 30 is reduced, thereby reducing wear and extending the service life of the pump body assembly. Moreover, while ensuring the sealing performance of the pump body assembly, the material loss is reduced, thus saving costs.

[0039] As Figure 4 , Figure 5 shown, in this embodiment, the diameter D1 of the central hole 45, the diameter D2 of the first transition surface 42 and the inner diameter D3 of the cylinder block 20 satisfy: D1 < D2 < D3 * 0.25, so as to ensure the stable movement of the slider 40 in the cylinder block 20 and guarantee the stable operation of the pump body assembly.

[0040] Specifically, D1 < D2, which means the positional relationship among the slider 40, the crankshaft 10 and the roller 30 is that the slider 40 is located between the crankshaft 10 and the roller 30. D2 < D3 * 0.25, which means the slider 40 has sufficient rotation and sliding space in the cylinder block 20, so as to achieve the transportation of fluid.

[0041] By adjusting the dimensional relationship among the central hole 45, the first transition surface 42 and the inner diameter of the cylinder block 20, the pump body assembly can maintain excellent sealing performance and stability in high-precision fluid transmission. The diameter of the second transition surface 44 is also D2 and also satisfies this ratio relationship, which will not be elaborated here.

[0042] In this embodiment, the roller 30 has a third sliding surface that cooperates with the first sliding surface 41. The extension length L1 of the first sliding surface 41 in the circumferential direction of the slider 40 and the length L3 of the third sliding surface satisfy: 0.1 ≤ L1 / L3 ≤ 1, so as to ensure the effective contact and sealing between the slider 40 and the roller 30.

[0043] Specifically, in this embodiment, the third sliding surface is the sealing surface that contacts the first sliding surface 41 when the first sliding surface 41 slides along the limiting channel of the roller 30. L3 is the length of the third sliding surface along the extension direction of the limiting channel. The sealing surface that contacts the second sliding surface 43 in the limiting channel of the roller 30 is called the fourth sliding surface. The fourth sliding surface is arranged opposite to the third sliding surface, and its length is also L3. The ratio of L1 / L3 is the ratio of the length of the slider 40 to the limiting channel along the length direction of the limiting channel when the slider 40 is located in the roller 30. By precisely matching the ratio L1 / L3, the pump body assembly can maintain stable sealing performance, reduce leakage and energy consumption, and optimize the fluid transmission efficiency and stability of the pump body assembly, thereby maintaining efficient and stable fluid transmission and extending the service life of the pump.

[0044] In this embodiment, the first sliding surface 41 and the second sliding surface 43 have the same extension length in the circumferential direction of the slider 40; and / or the first transition surface 42 and the second transition surface 44 have the same extension length in the circumferential direction of the slider 40, so that the movement of the slider 40 in the cylinder body 20 is more balanced, reducing the vibration and noise that may be generated by the asymmetric design, and improving the operating smoothness of the pump body assembly.

[0045] Specifically, the slider 40 of this embodiment is symmetrically arranged, with the first sliding surface 41 and the second sliding surface 43 disposed opposite each other and having the same shape. The first transition surface 42 and the second transition surface 44 are symmetrically arranged, with the first transition surface 42 and the second transition surface 44 disposed opposite each other and having the same shape. Thus, the central angle corresponding to the projected arc of the second transition surface 44 is also A, and satisfies the condition 10° ≤ A ≤ 170°. This maintains the symmetry of the slider 40, making its movement within the cylinder 20 more stable and reliable.

[0046] like Figure 3 As shown, in this embodiment, the crankshaft 10 has two eccentric portions 11, and the sliders 40 have two eccentric portions 11. The two eccentric portions 11 are correspondingly located in the center holes 45 of the two sliders 40, and the eccentric directions of the two eccentric portions 11 differ by 180°. In this way, on the one hand, this double eccentric design can balance the torque of the pump body assembly during operation, reduce the vibration of the pump body, and improve its operating stability. On the other hand, through the interaction between the slider 40 and the roller 30, stable fluid delivery is achieved.

[0047] Specifically, the roller 30 of this embodiment is provided with two limiting channels, which are arranged along the axial direction of the crankshaft 10 and are arranged perpendicularly to each other. The extension direction of the two limiting channels is perpendicular to the axial direction of the slider 40, so that the sliders 40 respectively located in the two limiting channels are also arranged along the axis of the crankshaft 10, and the sliding directions of the two sliders 40 in the limiting channels are perpendicular to each other. Among them, the two eccentric parts 11 of the crankshaft 10 are also arranged along the axis of the crankshaft 10, so that the two eccentric parts 11 are respectively located in the center holes 45 of the two sliders 40, and the two sliders 40 are staggered in the limiting channels. At the same time, since the length of the first sliding surface 41 along the extension direction of the limiting channel is less than the length of the limiting channel, a variable volume cavity can be formed between the slider 40 and the roller 30 along the movement direction of the slider 40. In this way, when the crankshaft 10 rotates, the eccentric part 11 drives the slider 40 to slide back and forth in the limiting channel of the roller 30 while interacting with the roller 30, so that the roller 30 and the slider 40 rotate in the cylinder body 20, thereby causing the variable volume chamber to continuously change to realize fluid transportation.

[0048] The structure of this embodiment makes the sliding of the slider 40 in the limiting channel change regularly and periodically, thereby making the torque fluctuation of the pump assembly small and the operation smooth. Figure 2 As shown, when one of the sliders 40 is located at one end of its corresponding limiting channel, the left variable volume chamber located on the left side of the slider 40 is compressed to the minimum value, and at the same time, the other slider 40 is located in the middle position of its corresponding limiting channel. Then, as the crankshaft 10 rotates, the slider 40 located at the end of the limiting channel gradually moves toward the other end, and the slider 40 located in the middle position of the limiting channel gradually moves toward the end of the limiting channel, thereby realizing stable fluid delivery.

[0049] The structural form of the slider 40 of this embodiment is such that when the variable volume cavity on one side of the slider 40 is compressed to the minimum value, a residual volume cavity will still appear at the edge of the first transition surface 42 or the second transition surface 44 of the slider 40. Since the liquid is incompressible, the residual volume cavity has no effect on the transportation of the liquid.

[0050] like Figure 1 As shown, in this embodiment, the cylinder body 20 has a liquid suction channel 21 and a liquid discharge channel 22. The liquid suction channel 21 and the liquid discharge channel 22 are arranged opposite to each other on the peripheral side of the cylinder body 20 and are both connected to the inner cavity of the cylinder body 20, thereby ensuring that the pump body assembly can continuously inhale and discharge fluid during operation, thereby improving its working efficiency and being suitable for industrial processes that require continuous fluid transmission.

[0051] In this embodiment, the suction channel 21 communicates with the variable volume chamber and delivers refrigerant into the variable volume chamber, while the discharge channel 22 communicates with the variable volume chamber and discharges the refrigerant in the variable volume chamber through the discharge channel 22. The relative arrangement of the suction channel 21 and the discharge channel 22 ensures that the liquid intake and discharge processes of the pump assembly are balanced and stable during continuous operation, avoiding dead zones or turbulence during fluid transmission, and improving the efficiency and reliability of the pump.

[0052] The utility model also provides a fluid machinery, including the above-mentioned pump body assembly, thereby reducing the production cost of the fluid machinery and at the same time meeting the reliable operation of the fluid machinery, improving production efficiency and safety, and reducing energy consumption and maintenance costs.

[0053] In this embodiment, the fluid machinery is a fluorine pump. A fluorine pump is a pump specifically designed to transport fluoride solutions or gases. Due to the highly corrosive and unique physical and chemical properties of fluorides, the pump's materials and design requirements are extremely high. The pump assembly of this embodiment, by optimizing the fit of the crankshaft 10, roller 30, and slider 40, and controlling the size and shape of each component, can effectively address the corrosiveness of fluorides while ensuring efficient operation of the pump. For example, in the fluorine chemical industry, fluorine pumps can safely and efficiently handle various fluorides, including hydrogen fluoride and sodium fluoride.

[0054] It should be noted that, in the above embodiments, a plurality refers to at least two.

[0055] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0056] 1. Solve the problem that the processing of the slider of the rotary cylinder pump in the prior art is relatively complicated, resulting in high manufacturing costs;

[0057] 2. By providing the outer peripheral side of the slider with a first sliding surface, a first transition surface, a second sliding surface, and a second transition surface connected end to end in sequence, on the one hand, the cylindrical surface on which the first transition surface is located and the cylindrical surface on which the second transition surface is located are the same cylindrical surface, thereby reducing the difficulty of processing, and facilitating improved processing accuracy and reduced processing costs. On the other hand, the first sliding surface and the second sliding surface are sealed with the inner surface of the roller through surface contact, thereby improving the sealing effect and preventing the refrigerant and other flowing media from leaking from the contact surface between the slider and the roller, thereby reducing the performance of the pump assembly;

[0058] 3. This embodiment optimizes the structure of the slider while ensuring the sealing performance of the slider and the roller, reduces the processing difficulty of the slider, and reduces the cost of parts processing.

[0059] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0061] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A pump assembly, characterized in that: include: Crankshaft (10); A cylinder body (20), wherein the crankshaft (10) is passed through the cylinder body (20), and the crankshaft (10) is eccentrically arranged relative to the cylinder body (20) with a fixed eccentric distance; A roller (30), the roller (30) being rotatably disposed in the cylinder body (20) and sleeved on the outer side of the crankshaft (10); A slider (40), wherein the slider (40) has a center hole (45) for the crankshaft (10) to pass through, and the slider (40) is slidably arranged relative to the roller (30), wherein the outer peripheral side of the slider (40) includes a first sliding surface (41), a first transition surface (42), a second sliding surface (43) and a second transition surface (44) connected in sequence end to end, the first sliding surface (41) and the second sliding surface (43) are opposite to each other and are slidably matched with the inner surface of the roller (30), and the first transition surface (42) and the second transition surface (44) are two arc surface segments on the same cylindrical surface.

2. The pump assembly according to claim 1, characterized in that The curvature radius of the first transition surface (42) is less than half the inner diameter of the cylinder (20).

3. The pump assembly according to claim 1, characterized in that The first sliding surface (41) is a plane, an arcuate surface, or a combination of a plane and an arcuate surface.

4. The pump assembly according to claim 1, characterized in that Along a direction perpendicular to the axis of the slider (40), a central angle A corresponding to a projection arc of the first transition surface (42) satisfies the following condition: 10°≤A≤170°.

5. The pump assembly according to claim 1, characterized in that The diameter D1 of the center hole (45), the diameter D2 of the first transition surface (42) and the inner diameter D3 of the cylinder (20) satisfy: D1 <D2<D3*0.25。 6. The pump assembly according to claim 1, characterized in that The roller (30) has a third sliding surface that cooperates with the first sliding surface (41), and the extension length L1 of the first sliding surface (41) in the circumferential direction of the slider (40) and the length L3 of the third sliding surface satisfy the following relationship: 0.1≤L1 / L3≤1.

7. The pump assembly according to claim 1, characterized in that The first sliding surface (41) and the second sliding surface (43) have the same extension length in the circumferential direction of the slider (40); and / or The first transition surface (42) and the second transition surface (44) have the same extension length in the circumferential direction of the slider (40).

8. The pump assembly according to any one of claims 1 to 7, characterized in that: The crankshaft (10) has two eccentric parts (11), and the sliders (40) have two eccentric parts (11). The two eccentric parts (11) are correspondingly located in the center holes (45) of the two sliders (40), and the eccentric directions of the two eccentric parts (11) differ by 180 degrees.

9. The pump assembly according to any one of claims 1 to 7, characterized in that: The cylinder body (20) has a liquid suction channel (21) and a liquid discharge channel (22). The liquid suction channel (21) and the liquid discharge channel (22) are arranged opposite to each other on the peripheral side of the cylinder body (20) and are both connected to the inner cavity of the cylinder body (20).

10. A fluid machine, characterized in that: A pump body assembly comprising the pump body assembly according to any one of claims 1 to 9.

11. The fluid machine according to claim 10, characterized in that: The fluid machinery is a fluorine pump.

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